“…Researchers have attempted to define anxiety by categorizing it and differentiating its components. For example, the concept of two types of anxiety, "state" anxiety (a transitory reaction to a perceived threat) and "trait" anxiety (a consistent personality characteristic) has been proposed (Cattell & Scheier, 1961;Kellner et al, 1975;Spielberger, 1970). In addition, the physiological correlates of anxiety have been assessed and an attempt made to understand the relationship of physiological arousal to anxiety (Epstein & Clark, 1970;Fenz, 1967;Kelly et al, 1970;Krause, 1961;Tyrer, 1976).…”